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//
// Novell.Directory.Ldap.Utilclass.IntermediateResponseFactory.cs
//
// Author:
//   Anil Bhatia (banil@novell.com)
//
// (C) 2003 Novell, Inc (http://www.novell.com)
//

using System;
using System.Reflection;
using Novell.Directory.Ldap.Rfc2251;

namespace Novell.Directory.Ldap.Utilclass
{
    /// <summary>
    ///     Takes an LDAPIntermediateResponse and returns an object
    ///     (that implements the base class LDAPIntermediateResponse)
    ///     based on the OID.
    ///     You can then call methods defined in the child
    ///     class to parse the contents of the response.  The methods available
    ///     depend on the child class. All child classes inherit from the
    ///     LdapIntermediateResponse.
    /// </summary>
    public class IntermediateResponseFactory
    {
        /**
             * Used to Convert an RfcLDAPMessage object to the appropriate
             * LDAPIntermediateResponse object depending on the operation being performed.
             *
             * @param inResponse   The LDAPIntermediateResponse object as returned by the
             *                     extendedOperation method in the LDAPConnection object.
             * <br><br>
             * @return An object of base class LDAPIntermediateResponse.  The actual child
             *         class of this returned object depends on the operation being
             *         performed.
             *
             * @exception LDAPException A general exception which includes an error message
             *                          and an LDAP error code.
             */

        public static LdapIntermediateResponse convertToIntermediateResponse(RfcLdapMessage inResponse)
            //          throws LDAPException 
        {
            var tempResponse = new LdapIntermediateResponse(inResponse);
            // Get the oid stored in the Extended response
            var inOID = tempResponse.getID();

            var regExtResponses =
                LdapIntermediateResponse.getRegisteredResponses();
            try
            {
                var extRespClass = regExtResponses.findResponseExtension(inOID);
                if (extRespClass == null)
                {
                    return tempResponse;
                }

                Type[] argsClass = {typeof(RfcLdapMessage)};
                object[] args = {inResponse};
                Exception ex;
                try
                {
                    var extConstructor = extRespClass.GetConstructor(argsClass);

                    try
                    {
                        object resp = null;
                        resp = extConstructor.Invoke(args);
                        return (LdapIntermediateResponse) resp;
                    }
                    catch (UnauthorizedAccessException e)
                    {
                        ex = e;
                    }
                    catch (TargetInvocationException e)
                    {
                        ex = e;
                    }
                }
                catch (MissingMethodException e)
                {
                    // bad class was specified, fall through and return a
                    // default  LDAPIntermediateResponse object
                    ex = e;
                }
            }
            catch (MissingFieldException ex)
            {
                // No match with the OID
                // Do nothing. Fall through and construct a default LDAPControl object.
                Logger.Log.LogWarning("Exception swallowed", ex);
            }
            // If we get here we did not have a registered extendedresponse
            // for this oid.  Return a default LDAPIntermediateResponse object.
            return tempResponse;
        }
    }
}